Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien nang » thien bang, thien dang, trien nang
trinh vat » trinh van, trinh luat, sinh vat
hieu van » hieu va, thien van, lieu va
va trinh » van trinh, va tinh, lap trinh
tu trong » tu tuong, tu tieng
te sach » toc sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thien nang xa hoi. hieu van cam tuc va trinh vat ((cua tre) or (tu trong))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thien nang xa hoi. hieu van cam tuc va trinh vat ((cua tre) OR (tu trong)).
• Adding a wildcard symbol may retrieve word variants: te sach thien nang xa hoi. hieu van cam tuc va trinh vat ((cua tre) or (tu trong))*.